Pattern shaping using a reactively loaded wire loop antenna

Author

Li, R.L. ; Fusco, V.F. ; Cahill, R.

Author_Institution

Dept. of Electr. & Electron. Eng., Queen´´s Univ., Belfast, UK

Volume

148

Issue

3

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

203

Lastpage

208

Abstract

A method for obtaining continuous beam steering of ±30° from bore-sight by reactively loading a one-wavelength square wire loop antenna placed over a ground plane is presented. By introducing a small gap at the middle of one of the two non-radiating sides, the phase difference of current on the two radiating sides of the wire loop can be adjusted. This is done by varying a single reactive load at the middle of the opposite non-radiating side. As a result, the far-field radiation pattern of the antenna can be controlled in the plane perpendicular to the radiating sides. The input VSWR for the arrangement is shown to be insensitive to loaded reactance variation. An analytical explanation for the behavior of the antenna is given, together with experimental verification

Keywords

UHF antennas; antenna radiation patterns; beam steering; loop antennas; wire antennas; 1 GHz; continuous beam steering; current phase difference; far-field radiation pattern; input VSWR; nonradiating sides; one-wavelength square wire loop antenna; pattern shaping; radiating sides; reactively loaded wire loop antenna;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20010401

Filename

942848